Hydrides of Laves phases intermetallic compounds synthesized under high hydrogen pressure

High hydrogen pressure technique up to 1.2 GPa has been used for synthesis of novel hydrides in RFe2 Laves phases (R = Gd, Tb, Dy, and Ho) compounds as well as in pseudobinary ZrCo2 − xFex and YxDy1 − xMn2 Laves phases. Existence of new orthorhombic hydrides HoFe2H5, and DyFe2H5, isostructural with YFe2H5, was found, whereas GdFe2H5 and TbFe2H5 kept the cubic C15 lattice. Pseudobinary Zr(FexCo1 − x)2Dy (2 ≤ y ≤ 4) hydrides were synthesized and their stability was discussed as a function of Fe/Co content. It was revealed that the formation of non-interstitial YMn2H6-type Fm-3m hydrides is possible in the whole range of pseudobinary (YxDy1 − x)Mn2 compositions.